Mendelian Genetics Quiz

How many chromosomes do human cells contain?

• 92

• 23

• 69

• 46

Answer explanation

Human cells contain 46 chromosomes, not 92, 23, or 69.

What is an allele?

• A type of chromosome

• A combination of genetic code from both parents

• A type of blood type

• A section of DNA that codes for a specific gene

Answer explanation

An allele is a section of DNA that codes for a specific gene.

What does it mean to be homozygous?

• Having a recessive allele

• Having a dominant allele

• Having two different alleles for a specific gene

• Having two identical alleles for a specific gene

Answer explanation

Homozygous means having two identical alleles for a specific gene.

Which allele is dominant for blood type?

• A

• B

• O

• AB

Answer explanation

The dominant allele for blood type is A.

What is the difference between genotype and phenotype?

• Genotype and phenotype are the same thing

• Genotype refers to DNA, while phenotype refers to physical traits

• Genotype refers to physical traits, while phenotype refers to DNA

• Genotype refers to the mother's DNA, while phenotype refers to the father's DNA

Answer explanation

Genotype refers to DNA, while phenotype refers to physical traits. This is the correct choice.

What is the Punnett Square used for?

• Determining the dominant allele

• Determining the possible genotypes of offspring

• Determining blood type

• Determining the number of chromosomes

Answer explanation

The Punnett Square is used to determine the possible genotypes of offspring. It helps in understanding the inheritance patterns and predicting the genetic outcomes of a cross.

If both parents have the genotype AO, what is the possible genotype of their children?

• AA

• AB

• AO

• OO

Answer explanation

If both parents have the genotype AO, their children can have the genotypes AA or AO. The correct choices are AA and AO.

What percentage of the children will have blood type O if both parents have the genotype AO?

• 100%

• 50%

• 25%

• 75%

Answer explanation

If both parents have the genotype AO, there is a 25% chance that a child will have blood type O. Therefore, the correct answer is 25%.